Lift-jack for vehicles.



J. H. BURKHOLDER.

LIFT JACK FOR VEHICLES.

APPLICATION FILED OUT. 5. 1912.

Patented Dec. 1,1914

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LIFT JACK FOR VEHICLES.

APPLIOATION FILED 0015,1912.

1,119,241. 7 Patented De0.1,1914.

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TED STATES PATENT orrron.

JOHN H. BURKHOLDER, OF ASHLAND, OHIO, ASSIGNOR TO ELITE MANUFACTURINGCOMPANY, OF ASHLAND, OHIO, A CORPORATION OF OHIO.

LIFT-JACK FOR VEHICLES.

Specification of Letters Patent.

Patented Dec. 1, 1914.

Application filed October 5, 1912. Serial No. 724,019.

1 '0 alt whom it may concern:

Be it known that 1, JOHN H. BURK- HOLDER, citizen of the United States,residing at Ashland, in the county of Ashland and State of Ohio, haveinvented certain new and useful Improvements in Lift-Jacks for Vehicles,of which the following is a specification.

This invention relates to lift jacks for yehicles, and is an improvementon the style of jack shown and described in Letters Patent of the UnitedStates issued to me on the 3rd day of October, A. D. 1912, and numbered1,004,741, the same being known to the trade as a tire saver. The saidtire saver jack, however, has a certain limitation which it is theobject of the present invention to remedy. For example, when the jack isplaced beneath a wheel axle or hub and the lift standard is brought upagainst the same from beneath and engaged a single downward movement ofthe actuating lever is the limit of action, and the vehicle is thusraised high enough to at least relieve the tire but it cannot be raisedhigher. Of course this was and is suflicient for tire saving purposes asthe jack lifts high enough to take the weight of the load from the wheeland tire, but often it is desirableto raise the vehicle so that thewheel can be rotated or removed, and the present invention provides forthis additional elevation and enables the load to be raised step by stepto any desired height and also to be lowered by a like movement, allsubstantially as shown and described and particularly pointed out in theclaims.

In the accompanying drawings, Figure 1 is a side elevation of the jackshowing the parts in raising position. Fig. 2 is a cross sectionsubstantially on line w-w, Fig. 1, omitting the upper yoke or pawl. Fig.3 is an elevation of the jack with the parts in lowering position andthe lower pawl engaged, and Fig. 4 is a view corresponding to Fig. 3with the upper pawl engaged and the lower pawl disengaged, ashereinafter fully described. Fig. 5 is a perspective detail of thetripping or reversing device.

Having reference now to the parts, 8 represents the standard, which hasthe usual base and is provided with a pl..in straight front edge havinglateral flanges 9. which are slidably engaged by clips or ears 3 on theends of the lift-bar or member I). The

said lift bar has an arm a at its top in which the support 4 isrotatably seated through its shank or stem, as formerly, but a rigidsupport instead of a rotatable one might be used on said arm. The saidbar also has the usual ratchet teeth 5 at its front edge, and said teethare adapted to be operatively engaged by the two yoke or clevis shapedpawls c and (l. The upper of these pawls or yokes is pivoted on theshort arm or extension 6 on lever 7 inside its pivot 8 at the top ofstandard 8, while the pawl d is pivoted at 9 on said standard andrelatively beneath pawl o. The said pawls work in unison as the said barI) is raised and lowered, and the operation of both is step by step onthe ratchet teeth 5. That is only one step is taken at a time with eachcomplete stroke of lever 7 up or down. In either or both directions ofmovement the pawl or yoke 0 is positively actuated while the pawl doperates by gravity when the lift-bar is being raised but is releasedand thrown out to engage the next higher' tooth by the reversingmechanism when the said bar is being lowered.

Thus, assuming that the said bar is being raised to lift the load, as inFig. 1, it will be seen that the pawl cl takes and holds the load whilepawl c is being lowered to another gripping position, andsaid pawl 01then drops by gravity over the next tooth beneath, being free on itspivot 9. On the other hand when the load is to be lowered the reversingdevice it is rotated on its pivot from position Fig. 1 to position Fig.3. structurally the said device or part is shown ashaving controllingarm 10, an actuating projection or finger 12 and a lug 13 on its insideadapted to engage the pawl (Z. The said finger is brought into use whenthe parts are changed to position for lowering the lift-bar, as in Fig.3, when it is adapted to bear against the swell or enlargement 1 1 onyoke c and cause the said yoke to swing outward on its pivot and freefrom engaging relations with the teeth 5 in the lowering operation ofthe lift-bar. as seen in Fig. 3. Said figure also shows the yoke or pawl(Z in supporting relations with teeth 5, and it is free to gravitate tothis position the moment that the spring m and arm 10 are pressed backfar enough by the action of swell 14 on projection 12 under the weightof the load on the lift-bar and as the lever 7 is being raised. Then asthe said pawl drops into action the load is taken from yoke 0 and thecounter pressure of springmasserts itself and throws the said yoke outas in Fig. 3. Then as the lift-bar is lowered still farther and the yokec is free it clears itself above finger 12 and drops back to engagingrelations and again takesthe load on the next tooth above the one itreleased. As it does this the pawl 02 is kicked off by the spring andremains there until itis released by the action of the yoke onprojection 12 as before and so on successively. It should be understoodhere that with the load on the lift-bar the said swell ld'exerts apositive pressure against finger l2 and the spring m and forces saidparts back while the liftbar and pawl c are being lowered. Thisliberates pawl d from spring pressure and v lets it gravitate toengaging position as above described. "Said pawl d therefore makes'suchengagement and takes the load on-the lift-bar while yoke cis lowered-alittle farther. As this occurs the springm reacts on thel-deviceh'andinstantly throws pawl c outward clear ofteeth 5, -F ig. 3. Then.instantly said pawl drops back-toeneas P sition, and a reversal of saidlever and parts repeats theformer operation aintil .atlast the load islowered as far as required. The said spring at is secured at about thelower end of the guard or stop 18 which is cast integralwith thestandards inthis instance and has an outwardly extending flange fromits" bottom upward as shown to afford the spring all the necessaryrearward movement :and yet "serve to prevent thereversing device it frombeing rotated inthe wrong direction. These positions severally are seenin Figs. 1, 3 and 4, with slight changes: in the position of .the springwhen the trip 1/2, is reversed.

It follows from theforegoing that inwthe raising of the liftbarfthetwopawls are free to slide overthe backs of the ratchet teeth and toengagesuccessi'vely as the lift proceeds, first one and then the otherand the trip or reversing device it is looked back out of use. This isdone by rotation of the device to position Fig. 1, thus carryingprojection 12 to the rear. On the other hand, when the lift-bar is beinglowered the pawl o is'first'kicked off by the action of spring onandthenthepawld in succession, the throw outward from the ratchet teethmomentarily of each being necessary to obtain the step by step loweringof the lift-bar and load. Thesemovem'ents also are automatic and n0 handaction is required except to reverse thesaidtrip according to the next.movementdesired, whether toraise or lower the load.

What I claim is:

1. In; lift jacks for vehicles, a standard having a rigid inclined guardextending laterally at its rear and side, a pawl pivoted on saidstandard-"in front of said guard, a reversing device on the pivot '.ofsaid pawl opposite said guardnnd -a flat spring hearing against-saiddeviceandlimited in its outward movement by said guard.

2. In lift j ac'ks,ia" standard and-a- 'liftbar slidably mountedvthereon having ratchet teethya lever pivoted on'said standard and ayoke :hung' from said lever engaging said teeth, in-rcombination' -w1thtake-up pawl pivoted on :said standard relatively. be-

neath said; yoke,-a reversing device having a fingerto engagebeneath-said yoke and. lift the same and aprojection-on its inner sideextendingfibeneathsaid pawl, a flat spring fixedatiits "lower end tosaid standard and adapted to bear *a'gainstsaid projection in both "itsposit'i0ns wof operation.

' I=n-testimony whereof. I a'fiix my signaturein gpresence'iof'i twowitnesses.

JOHN H. *BURKHOLDER. Witnesses:

JAY .Taeennr, C. G. GrrArMA-N.

Copies ofi thia patentmay'be obtained for fiveoe'nts each, byaddressing-the Commissioner-of. Patents.

Washington, new

